IEC 62305-1:2010

Overview

IEC 62305-1:2010 - Protection against lightning, Part 1: General principles defines the general principles for protecting structures, their installations and contents, and people from lightning. This second edition (2010) is a technical revision of the 2006 edition and introduces several important updates: it no longer covers protection of services connected to structures, it adds isolated interfaces as protection measures for electrical/electronic systems, it introduces the first negative impulse current as a lightning parameter for calculations, and it refines expected surge overcurrents for low-voltage power and telecommunication systems.

Keywords: IEC 62305-1, protection against lightning, lightning protection standards, lightning protection systems.

Key topics and technical requirements

• Scope & principles: Establishes foundational concepts and terminology used across the IEC 62305 series (threat, risk, protection measures).
• Lightning current parameters: Defines parameters used for design and testing (including the newly introduced first negative impulse current) and supplies statistical values and probability tables.
• Damage and types of loss: Categorizes effects of lightning on structures, installations and people; links effects to appropriate protection responses.
• Risk and economic justification: Points to risk assessment methodology (see IEC 62305-2) to determine need and cost-effectiveness of protection measures.
• Protection measures overview: Describes classes of measures to reduce:
  • physical damage and life hazard (further detailed in IEC 62305-3),
  • failures of electrical and electronic systems (further detailed in IEC 62305-4), including isolated interfaces and surge protection.
• Basic design criteria: Introduces Lightning Protection Levels (LPL), Lightning Protection Zones (LPZ) and criteria for selecting measures.
• Informative annexes: Provide reference data and methods for lightning parameters, time functions, simulation and test parameters, and expected surge overcurrents for different installation points.

Keywords: lightning current parameters, LPL, LPZ, surge overcurrents, isolated interfaces.

Practical applications - who uses this standard

• Design and electrical engineers developing lightning protection systems (LPS) and surge protective measures (SPM).
• Architects and safety managers assessing building resilience to lightning.
• Telecommunications and power distribution engineers designing low-voltage and telecom protection.
• Test laboratories and manufacturers of LPS/SPM components for compliance and test planning.
• Regulators and certification bodies referencing harmonized international requirements.

Keywords: lightning protection systems, surge protection, low-voltage protection, telecommunication protection.

Related standards

• IEC 62305-2 - Risk management for lightning protection.
• IEC 62305-3 - Physical damage to structures and life hazard protection (LPS).
• IEC 62305-4 - Protection of electrical and electronic systems within structures (SPM).

Using IEC 62305-1 ensures consistent terminology, selection criteria and reference data across the IEC 62305 series for effective, economically justified lightning protection design and implementation.